What is the difference between Claude Fable 5.1 and Kimi K2 0905?

Claude Fable 5.1 is developed by Anthropic while Kimi K2 0905 is developed by Moonshot AI. Claude Fable 5.1 has a 1.0M token context window vs Kimi K2 0905's 262K. You can compare their actual outputs across 10 challenges on Rival to see how they differ in practice.

Which is better, Claude Fable 5.1 or Kimi K2 0905?

It depends on your use case. Claude Fable 5.1 and Kimi K2 0905 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 10 challenges so you can judge which fits your needs best.

How much does Claude Fable 5.1 cost compared to Kimi K2 0905?

Claude Fable 5.1 costs $10/M input tokens and Kimi K2 0905 costs $0.6/M input tokens. Kimi K2 0905 is $9.40/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Claude Fable 5.1 and Kimi K2 0905 on Rival?

This page shows a side-by-side comparison of Claude Fable 5.1 and Kimi K2 0905 across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

Updated Sep 2026

Claude Fable 5.1vsKimi K2 0905

Kimi K2 0905 is cheaper than Claude Fable 5.1 at $0.6/M vs $10/M input tokens.

Claude Fable 5.1 and Kimi K2 0905 compared across 10 shared prompts
Spec	Claude Fable 5.1	Kimi K2 0905
Input price	$10/M tokens	$0.6/M tokens
Output price	$50/M tokens	$2.5/M tokens
Context window	1.0M tokens	262K tokens
Weights	Closed	Open
Free API (OpenRouter)	No	No
Released	Sep 2026	Sep 2025

Our Verdict

Claude Fable 5.1

Kimi K2 0905Runner-up

Not enough votes to call it. On the specs, Claude Fable 5.1 has the edge: newer, bigger context window, major provider backing.

Kimi K2 0905 costs 20x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude Fable 5.1

Input

$10.00

Output

$50.00

Kimi K2 0905

Input

$0.60

17× cheaper

Output

$2.50

20× cheaper

Kimi K2 0905 is cheaper on both: 17× input, 20× output.

Where to run it

5 hosts

Claude Fable 5.14 hosts

HostInOutContextUptime

Amazon Bedrock$10.00 in$50.00 out1M—Anthropic$10.00 in$50.00 out1M99.1% up Azure AI Foundry$10.00 in$50.00 out1M99.1% up Google Vertex AI$10.00 in$50.00 out1M99.8% up

Kimi K2 09051 host

HostInOutContextUptime

Novitafp8$0.60 in$2.50 out262k100% up

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

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More comparisons

Cost per 1M tokens

5 hosts

What we learned reading every model

Common questions

What is the difference between Claude Fable 5.1 and Kimi K2 0905?

Which is better, Claude Fable 5.1 or Kimi K2 0905?

How much does Claude Fable 5.1 cost compared to Kimi K2 0905?

How can I compare Claude Fable 5.1 and Kimi K2 0905 on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

5 hosts

What we learned reading every model

Common questions

What is the difference between Claude Fable 5.1 and Kimi K2 0905?

Which is better, Claude Fable 5.1 or Kimi K2 0905?

How much does Claude Fable 5.1 cost compared to Kimi K2 0905?

How can I compare Claude Fable 5.1 and Kimi K2 0905 on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages